Finding the Fourth Proportional to 78,820.81, 108,891.19 and 51,661.34

Step by Step Solution

1. Step 1: Write the proportion equation
   78,820.81 : 108,891.19 = 51,661.34 : x
2. Step 2: Convert to fraction form
   78,820.81/108,891.19 = 51,661.34/x
3. Step 3: Cross multiply
   78,820.81x = 108,891.19 × 51,661.34
4. Step 4: Simplify right side
   78,820.81x = 5,625,464,789.59
5. Step 5: Solve for x
   x = 5,625,464,789.59/78,820.81
6. Step 6: Final answer
   x = 71,370.30